Kids have always been like this, and always will be like this. Undeveloped brains don’t understand danger. It’s all fun and games bouncing against a window until the frame gives way.
Kids were just as badly behaved when I was at high school in the early 90s, and just as badly behaved when my parents were at high school in the 60s. There really is nothing new under the sun, it’s just that with camera phones and CCTV you get to see what they’re up to now.
Until I saw the CCTV I did wonder how the window gave way, as you’d expect it to take quite a bit of force otherwise people would be ejected from the bus in a crash.
But
the CCTV from a nearby building shows just how many kids were pushing against it. Most managed to scrabble back inside the bus but three of them didn’t.